PHYSICS Forces in balance CHAPTER 8 (P4- Levers can be used to exert a…
PHYSICS Forces in balance CHAPTER 8
P1- Displacement is distance in a given direction.
P2- A contact force is a force that acts on objects only when the objects touch each other.
P4- To increase the moment of a force, increase F or increase D.
P2- Forces can change the shape of an object, or change its motion or its state of rest.
P2- When two objects interact, they always exert equal and opposite forces on each other.
P4- Levers can be used to exert a force that is greater than the effort.
P1- A scalar quantity has magnitude but no direction.
P1- A vector quantity is a physical quantity which has magnitude and direction.
P1- A vector quantity can be represented by an arrow in the direction of the vector and of length in proportion to the magnitude of the vector.
P2- The unit of force is the newton (N).
P4- The moment of a force is a measure of the turning effect of the force on an object.
P4- The moment of a force about a pivot is M (newton metres) =F (newtons) X D (meters)
(moment = force x perpendicular distance from the line of action of the force to the pivot)
MOMENTS AT WORK
VECTORS AND SCALARS
FORCES BETWEEN OBJECTS